Phone numbers in Avalon, California
Avalon has 9 phone prefixes in area codes 310, 424.
Biggest holders: AT&T (local phone), IP Horizon, North County Communication. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 11%
- Internet / business phone carrier 67%
- Phone company 22%
Every prefix in Avalon
Search the first six digits of a number in this list. If it's here, the number started in Avalon with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 310-510 | AT&T (local phone) | Local phone company | – |
| 310-929 | IP Horizon | Internet / business phone carrier | – |
| 310-949 | North County Communication | Phone company | – |
| 424-226 | MCImetro (Verizon Business) | Internet / business phone carrier | 2007 |
| 424-334 | Level 3 (Lumen) | Internet / business phone carrier | 2013 |
| 424-377 | Onvoy | Internet / business phone carrier | 2016 |
| 424-432 | Voip Innovations | Internet / business phone carrier | 2019 |
| 424-738 | AT&T Enterprises | Phone company | 2009 |
| 424-855 | Fractel | Internet / business phone carrier | 2022 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.